.error{
    color: red;
}

.warn{
    color: orangered;
}

.success{
    color:green
}

nav ul,li{
    list-style: none;
    margin: 0;
    padding: 0;

}

nav li {
    float: left;
    padding: 5px;

}

nav li:hover{
    border: 1px solid green;
    border-radius: 5px;
    background-color: greenyellow
}



nav ul {
    background-color : red;
}


nav ul:after{
    content:'';
    display: block;
    height:0;
    clear: both;
    overflow:hidden;
}

#left{
    display:inline-block;
    width: 20%;
    height: 400px;
    border: 1px solid dodger}

#right{
display:inline-block;
position:relative;
background: lightgray;
height:400px;
width:80%;
}

